[meteorite-list] CONCEPTION JUNCTION, MISSOURI PALLASITE - AD/test

[Steve Dunklee]

Interesting composition! Might this hint the meteorite may be extra solar? a visitor from another star system? only time will tell!
Cheers
Steve Dunklee

--- On Sat, 8/27/11, Dave Gheesling <dave at fallingrocks.com> wrote:

> From: Dave Gheesling <dave at fallingrocks.com>
> Subject: Re: [meteorite-list] CONCEPTION JUNCTION, MISSOURI PALLASITE - AD/test
> To: "'Michael Fowler'" <mqfowler at mac.com>, meteorite-list at meteoritecentral.com
> Date: Saturday, August 27, 2011, 11:50 PM
> Michael & All,
> 
> Dr. Wasson submitted his classification of the Conception
> Junction pallasite
> (PMG) to the Nomenclature Committee last month, and
> presumably it will be
> posted to the Meteorite Bulletin before long.  Since
> much of this
> information is not publicly available at the moment, please
> find below an
> excerpt from Dr. Wasson's contribution to the
> monograph.  He also complied
> an interesting chart for comparative analysis, but I'm not
> sure how to post
> that information with plain text.  Anyway, hope this
> helps answer some of
> the good questions that have been posted:
> 
> "The information I report here shows there is no main-group
> pallasite that
> is closely related to Conception Junction.  Conception
> Junction is unique.
> 
> "If I compare Conception Junction with other main group
> pallasites (PMG)
> with Au contents within 10% of that in Conception Junction
> (i.e. in the
> range 2.0 to 2.5 mg/g Au), only Seymchan and PCA 91004 have
> Ir
> concentrations within a factor of two of that in Conception
> Junction.
> 
> "If I sort on Ir, I find that there is no other PMG among
> the 40 that I have
> studied that has a closely similar Ir value.  The
> nearest are Pescora
> Escarpment 91004 (0.76 mg/g Ir), Seymchan (0.67 mg/g) and
> Barcis, a scarcely
> studied Russian PMG (0.32 mg/g Ir).
> 
> "The Co content of this sample is high (6.0 mg/g). If I
> sort my PMG data on
> the basis of Co, I find that there are three irons with
> higher Co, namely
> Krasnojarsk, Rawlinna 001 and one sample of Phillips
> County, and a couple
> more that are slightly lower, namely Springwater and
> Zaisho.
> 
> "The Ni content is also rather low, as is shown in the
> chart below comparing
> Conception Junction to PCA 91004, Seymchan, Barcis and
> Krasnojarsk.
> 
> "In summary, the composition of the metal in Conception
> Junction differs
> from all other known pallasites."
> 
> All the best,
> 
> Dave
> www.fallingrocks.com
> www.conceptionjunctionpallasite.com
>  
> 
> -----Original Message-----
> From: meteorite-list-bounces at meteoritecentral.com
> [mailto:meteorite-list-bounces at meteoritecentral.com]
> On Behalf Of Michael
> Fowler
> Sent: Saturday, August 27, 2011 4:04 PM
> To: meteorite-list at meteoritecentral.com
> Cc: Michael Fowler
> Subject: [meteorite-list] CONCEPTION JUNCTION, MISSOURI
> PALLASITE - AD/test
> 
> 
> 
> Wasson's statement that: 
> 
> .there is no main-group pallasite that is closely related
> to Conception
> Junction. Conception Junction is unique." 
> 
> leaves open the question at to what is the
> classification?  Is it ungrouped,
> or perhaps, main group anomalous?
> 
> I would be most interested to know the major and trace
> element analysis so I
> could form my own opinion.
> 
> 
> Sincerely, 
> 
> Mike Fowler
> Chicago
> 
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